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f(1)=-(1-7)+3
We move all terms to the left:
f(1)-(-(1-7)+3)=0
We add all the numbers together, and all the variables
f1-(-(-6)+3)=0
We add all the numbers together, and all the variables
f-9=0
We move all terms containing f to the left, all other terms to the right
f=9
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